package com.atguigu.chaptar1

object HelloWorld {
  def main(args: Array[String]): Unit = {
    System.out.println("helloworld");
    println("helloworld");
    val a = 10;
    val b: Int = 5;
    val $100 = 5;
    val _1 = 1;
    val + = 3;
    var - = 1;
    var * = 3;
    var / = 4;
    var aa = 1;
    aa = 2;
    var aaa: Int = 2;
    var aaaa = null;
    var sdf = 1;
  }

}
